How do you drive the switching transistors in this case?
Because as far as I know, transistors are driven by base-emitter (gate-source) voltage and emitter (source) voltages are different for each couple of transistors, so how do you connect ic driver (buffer) to them?

Thank you all for your replies. In fact, I did not know that IR2110 contains an optocoupler... But now I can see very clearly how it works. I do not want to use transformer drive in my next project, I want to try direct drive, as the guy from d-amp.com recommends... but currently I am out of money

My suggestion is to use gate drive transformers. I play a little bit with IR's and I blow up a few(about 20). There are many aspects that you have to consider if IR's drivers are to be used.

First of all the IR's drivers don't assure galvanic insulation.The high side channel is build in a so called "isolated silicon tube".One of the most important thing is the PCB layout.Take care of undershooting.

Because of the layout I had to many incidents and finally I "fixed up"a few PWM controllers and an ATMega8.

After two months I could make a good PCB for an inverter that works fine with IR's, but was two expensive months of trial and errors.

So, if you have some "extra money" you could try to build your bridge but be aware of pcb.Use ground plane.Helps a lot.